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Hydrogen molecules are slightly polar because the oxygen is able to pull the shared electrons towards it. This means there is a positive and negative end.· Solvent ­ able to interact with charged parts of other molecules, surround them, and therefore dissolve them. 70-95% of cytoplasm in water. Necessary to perform respiration and photosynthesis.· Liquid ­ transport medium e.g. blood vascular tissue. Stays liquid over a large temperature range.· Cohesion - xylem, creates surface tension, hydrogen bonds pull in water at the surface, walk on water.· Freezing ­ forms ice on the surface which insulates the water below it so organisms can survive in water all year round. Solid is less dense than liquid.· Thermal stability ­ Evaporation removes heat by using lots of energy e.g. panting, sweating, large bodies of water have fairly constant temperatures. Hydrogen bonds restrict movement, lots of energy needed to increase water temperature.· Metabolic ­ Hydrolysis and photosynthesis.…read more